I-Pentamethyldiethylenetriamine (pmdeta)

I-methyl eyisihlanu i-ethyleneamine emithathu iyisisusa esisebenza kakhulu sokusabela kwe-polyurethane.Ikhuthaza kakhulu ukusabela okukhihliza amagwebu, futhi iphinde isetshenziselwe ukulinganisa ukusabela kwegwebu kanye nejeli.Isetshenziswa kabanzi kuzo zonke izinhlobo zegwebu eliqinile le-polyurethane, kufaka phakathi i-polyisocyanurate plate rigid foam.Ngenxa yomphumela wayo onamandla wegwebu, ingathuthukisa ukugcwala kwegwebu, ngakho-ke ithuthukisa inqubo yokukhiqiza futhi ithuthukise umthamo wokukhiqiza.Ivamise ukwabelana ne-DMCHA nokunye.I-methyl two ethyleneamine three amine isetshenziswa iyodwa njenge-catalyst yefomula yegwebu le-polyurethane, futhi ingabiwa namanye ama-catalyst.0-2.0 izingxenye ngezingxenye eziyi-100 ze-polyol.
Ngaphezu kokwakhiwa kwegwebu eliqinile, ama-methyl amabili amabili ethyleneamine amathathu angasetshenziswa futhi ekukhiqizeni i-polyether polyurethane igwebu elithambile kanye negwebu elibumbayo.Isibonelo, i-70% ye-pentamethylenediethylenetriamine isetshenziswa ikakhulukazi ekwakhiweni kwemikhiqizo yegwebu elithambile.I-catalyst inomsebenzi ophezulu, isivinini esigcwele amagwebu ngokushesha, ukuqina okuphezulu kanye nomthamo omkhulu wokuthwala.Kugwebu elithambile, i-0.1-0.5 phr ye-catalyst nge-100 phr ye-polyether ingaba nomphumela ongcono.Ingasetshenziswa futhi njenge-catalyst eyisizayo yegwebu eliqinile.
I-methyl eyisihlanu i-ethyleneamine emithathu ye-amine quaternary ammonium salt iyisisusa esibambezelekile segwebu elithambile, elisetshenziselwa ukwelula isikhathi sokukhihliza.Ifanele imikhiqizo ye-foam enesimo esiyinkimbinkimbi kanye nenqubo yebhokisi yohlobo lwe-foaming, futhi ithuthukisa ukwakheka kwegwebu futhi ithuthukise ikhwalithi yokubumba.Ibanga lemithamo yalo libanzi impela, futhi ukushintshwa komthamo akunawo umthelela osobala ngesikhathi sokwenza mhlophe;Kodwa ukwandisa umthamo kunganciphisa isikhathi sokukhuphuka kwegwebu futhi kunciphise isikhathi sokuphulukisa.